β-Farnesene Block Copolymer Adhesive Composition for Heat Resistance
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Solution Overview
Problem
Existing adhesive compositions based on block copolymers of aromatic vinyl and conjugated diene compounds lack high heat resistance and biobased content, necessitating improvements for broader applications.
Innovation Solution
Incorporating a block copolymer with polymer blocks derived from β-farnesene and a tackifier, along with unhydrogenated or hydrogenated block copolymers with less than 50% hydrogenation, to enhance biobased content and heat resistance, while maintaining moderate adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a block copolymer containing polystyrene and polyfarnesene blocks is used to increase biobased content, then the biobased content is improved, but the heat resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the degree of hydrogenation of the polyfarnesene block within 0-50 mol% to optimize the balance between biobased content and heat resistance. Additionally, the glass transition temperature of the polyfarnesene block is controlled within -70°C to -30°C to achieve the desired thermal properties while maintaining high biobased content
Solution Approach 2:
The patent creates a composite adhesive system by combining the block copolymer (with controlled hydrogenation degree) and a tackifier resin, where the tackifier content is optimized at 20-150 parts by mass per 100 parts of block copolymer. This composite approach enables simultaneous achievement of high biobased content and improved heat resistance through synergistic interaction between components
2Quantity of substance
If the adhesive composition is formulated for high biobased content, then the biobased content is improved, but the adhesive strength may be compromised
Solution Approach 1:
The patent optimizes adhesive strength by precisely controlling the glass transition temperature of the polyfarnesene block within -70°C to -30°C and the degree of hydrogenation within 0-50 mol%. These parameter adjustments ensure the polymer maintains appropriate flexibility and bonding characteristics while preserving high biobased content
Solution Approach 2:
The patent references conventional adhesive formulations (using petroleum-based polymers) and creates a biobased alternative by replacing the polyfarnesene block with a bio-derived counterpart while maintaining similar structural and functional parameters, thereby achieving comparable adhesive performance with high biobased content
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adhesive composition achieves high biobased content, moderate adhesive properties, and improved heat resistance, with enhanced crosslinkability and flexibility, suitable for various applications.
Implementation Method 1
the block copolymer (X) has a glass transition temperature (Tg) of -52°C or lower
Implementation Method 2
a hydrogenated block copolymer (X1) which is a hydrogenated block copolymer and has a degree of hydrogenation of less than 50 mol%
Implementation Method 3
at least one selected from the group consisting of the unhydrogenated block copolymer (X0) and the hydrogenated block copolymer (X1) having a degree of hydrogenation of less than 50 mol% is crosslinked
Data Source
AI summary
It is provided an adhesive composition having a high biobased content and having a moderate adhesive property and high heat resistance and a method for producing the same, and an adhesive composition including: a block copolymer (X) including a polymer block (A) containing a structural unit derived from an aromatic vinyl compound and a polymer block (B) containing a structural unit derived from a conjugated diene compound, and a tackifier (Y), in which the block copolymer (X) includes, as the polymer block (B), at least one polymer block (B-1) containing a structural unit derived from β-farnesene, and the block copolymer (X) include at least one selected from the group consisting of an unhydrogenated block copolymer (X0) which is a block copolymer that is not hydrogenated, and a hydrogenated block copolymer (X1) which is a hydrogenated block copolymer and has a degree of hydrogenation of less than 50 mol%.